Michael hiesohbeck



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M. I-I'IRSCHBEGK. Machine for Grinding andPolishing Stone.

No. 231,318. Patented Aug. 17,1880..

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WITNESSES INVENTOR. /z MM 6M N. PETERS. PHDTKLLITHOGRAFHER. WASHINGTON. Dv C.

UNITED STATES PATENT OFFICE.

MICHAEL HIRSCHBECK, OF SOLNIIOFEN, BAVARIA, GERMANY.

MACHINE FOR GRINDING AND POLISHING STONE.

SPECIFICATION formingpart of Letters Patent No. 231,318, dated August 17, 1880.

Application led April 26, 1880.

To all 'whom t may concern:

Be it known that I,MrcHAEL HinscHEEoK, a subject of the Emperor of Germany, and a resident of Solnhofen, Bavaria, inthe Empire of Germany, have invented certain Improvements in Stone Grinding and Polishing Machines, (for which I have obtained German Letters PatentNo. 9,122, dated July 19, IS7 9,) of which the following is a specification.

The object of my invention is to construct a machine for the rapid and even grinding and polishing of stones, glass, and similar materials, and this object I attain in the manner which I will now proceed to describe, reference being had to the accompanying drawings, in which- Figure l, Sheet 1, is alongitudinal side elevation, partly in section; Fig. 2, Sheet 2, a plan view 5 Fig. 3, Sheet l, a transverse section 5 Fig. 4, Sheet 2, a side view and section of the sliding rod for giving reciprocating motion to the sliding table, and Fig. 5 a detached perspective view of the grinding-blocks drawn to an enlarged scale.

The frame A of the machine is provided with two longitudinal grooves or ways, B, Fig. 3, on which a table or tables, O, are arranged to slide, as in an ordinary planingmachine, the ways, however, being provided with protecting angle pieces or iianges D throughout their whole length, to prevent the access thereto of sand, dust, or small pieces of stone. There are two tables C shown in the present instance, so that when one carrying a stone, S, is placed under the grindingplate the other can be drawn out and the iinished stone removed and anew one substituted therefor, so as to be ready when the stone now being ground is withdrawn, the frame A being extended on each side of Ithe grinding portion sufciently for this purpose. The stone may be secured to its table in any suitable manner.

In the present instance I have shown the tables as provided with a number of openings, and pins are then inserted vertically into two or more of these openings at the sides of the stone S, and wedges are then driven in between the stone and pins where necessary. The openings in the table also permit the water and slime from the grinding operation to es- (No model.) Patented in Germany July 19, 1879.

cape through. Additional devices can be secured to the table in the same way to permit the grinding and polishing of special forms.

A longitudinal reciprocating motion is imparted to the table C on the ways on the frame at right angles to the movement of the grinding and polishing frame or plate E by means of a rod, m, adapted to slide in recesses in the cross-beams m2 m2, Fig. 4, below thetable, and connected by the rod m' with the crankwheel n. The table can be connected to the rod fm, by fitting a number of projections or ribs on the under side of the table into correspending notches in the upper edge of the rod m, or the table may be provided with suitable bolts, which, when the table has been slid into position, will fall into the notches in the rod m.

The crank-wheel a, which has a radial slot in which the end ofthe connecting-rod can be adjusted to vary the length of stroke of the table, receives its motion through the bevelgearing' p and pulleys p and p2 and belting 'from the driving-shaft T, Fig. 2.

The frame E, Fig. 2, which carries the grinding-blocks immediately above the stone, is adapted to slide at right angles to thc movement ot' the table C and stone on dovetailed guides on the cross-beams L, Figs. I and 3, 'the necessary reciprocating motion being impart-ed to the grinding-frame from the drivingshaft T through the rod t, connected to the slotted crank t on the said shaft. The length of stroke can be varied by adjusting the end of the rod t in the slot in said crank, Figs. 2 and 3.

The beams L, which carry the grindingframe, are adapted to vertical guides L L., Fig. 3, on the frame, and can be adjusted on said guides by means of the screws l l, passing through threaded openings in said beams. The upper ends of these screws are provided with bevel-wheels t' t', gearing into wheels 'i' on the horizontal shafts h. Each of the two shafts h carries aworm h', operated by a wormwheel., g', on the shaft g, carrying the handwheel f, by operating which the beams L and the grinding-frame can be raised or lowered, as will be readily understood.

The frame E carries a number of chilledmetal grinding-blocks, u, arranged in rows e,

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Fig. 2-six in the present instanceand in the grindingtrame are worked atI right angles to drawings are shown seven blocks in each l'ow.

Each row of blocks is retained in place latel'- f y the sand being worked evenly over the stone,

ally between two t'lat bars, I, extending across the frame, and between each pair of adjoining blocks in each row is a divisiolrboard, r, supported on the bars I, as shown in the enlarged detached perspective view, Fig'. 5. Each row 0f blocks, when once adjusted, is retained in place by a tighteningscrew, 1r, passing through one end otthe frame I, Figs. 2 and ii. To the frame E, above each row of blocks, is secured a flanged metal bar, .r, through which pass a number of' adjusting-screws, s, one t'or each block, as shown in Figs. l, 3, and 5, the bars and screws heilig shown removed in Fig'. L.

Vhcn the parts of the grirnling-t'rame are put together for the trst time, or the bloeks have for any reason become uneven, they are regulated in the following manner: One or other of the tables with its stone having been moved into position under the griiuling-t'rame, the latter is lowered until all the blocks rest on the stone, the screws all being loosened. The vertical screws are then gradually tightened, so that all the blocks are held down tlat on the stone. Then the end screws, u', are carefully tightened up. and the machine is ready for operation. 'I'he chilled-metal blocks need not be worked or smoothed down in any way before they al'e used.

On the top ol' the frame, between thc shafts lz, is arranged a sand box or receptacle, Il, with as many longitudinal hoppershaped divisions as there are divisions between the rows of' The bottoms ot' grilnling-bloeks underneath. these divisions terminate in slots, tln'ough which the sand, einery, or other grinding material can fall into the spacesbetween the rows of grinding-blocks, the tlow of' the sand being regulated by a suitable cut-oft' slide at the bottom of the receptacle.

In ol'der to prevent the sand t'rom getting into the screws, sheet-metal covers 1/ are areaeh other, an even surface and an equal grain is produced overthewholc surface of the stelle,

and not drawn into a ring or thrown out, asin machines with rotary or eccentric movements.

It' very thin edges have to be grounththe movement ot' the grindingplate should be quite, or almost, stopped, while the table and stone ai'e worked quickly, so as to produce a longitudinal draw-eut. The edges will then remain quite sharp, and can be cut at any desired angle.

It' very long' pieces are to be worked, two tables, (I, can he coupled togetherand worked as one. The tables may be worked b v ratchet-wheels and gearing' or screws, it' desired,

` especiallyv it' heavy work is to be donc.

The condition ot` a stone heilig' ground, can be observed at any moment during the operation ot' the machine, or a table with its stone can be removed from underthegrinding-frame and another substituted, by simply operating the wheel f'so as to l'aise the grinding-blocks from contact with the stone.

lf the stone is to be polished after it has been ground, the stone on its table is withranged over the rows ot' blocks, as shown in Fig. 1.

A proper supply ot' water may be provided by means ot rubber or other tubes ha vingregulating-valves, and arranged to terminate above the divisions between each blocks.

If it; is desil'ed to make the operation of the machine automatic, the wheel f should be so weighted as to have a continuous tendency to operate the worm-wheels and gearing', so as to row otI l l i l i l l keep the grinding-plate. continuously pressed on the stone.

Owing to the fact that the stone and the drawn from beneath the grinding-blocks and well cleaned t'rom sand. A sheet, of' feltisaturated with rouge is then placed under the frame E, to which a quick movement; is then imparted, while a slow reciprocating movement is imparted to the table and stone, so as to quickly obtain a good polish.

I claim as my inventionl. A stone-grinding machine provided with a grinding frame or plate, two tables carrying stones to he ground. and a frame having ways on which the tables can traverse, and which extend more than the length ot cach table beyond the grinding-plate, as and for the purpose set forth.

2. The grinding-frame provided wit-h blocks a, plates I and .1', and adjlisting-screws.

3. In a grinding-machine, the combination ot' the grimling-frame, having' rows of grind ing-blocks, with the sand-box divided into a corresponding number ot' slotted hoppers.

In testimony whereof Ihavesignedmyname to this specitication in the presence of two subscribing witnesses.

MICHAEL HIRSCHBEUK, Manager el' the SoInhQ/'cn Actcn Verein in Solnhef'cn, Barari'ri. Witnesses:

H. F. G. GmssE, CARL ENGERELY.

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